Neutral, low transmittance glass
AssigneesLibbey-Owens-Ford Co., Pilkington plc
InventorsRodney G. Baker, Paige L. Higby
Life of this patent
Estimating the term…
Abstract
A neutral, generally green-gray low transmittance (no more than 25 luminous transmittance) soda-lime-silica glass has reduced solar energy transmittance when provided with the following colorant constituents in percent by weight: ______________________________________ Fe.sub.2 O.sub.3 (total iron) 1.3-2 NiO 0.01-0.05 CoO 0.02-0.04 Se 0.0002-0.003 ______________________________________ The glass has a ferrous value in the range of 18 to 30.
Claims24
A soda-lime-silica glass having a base glass composition comprising on a weight percent basis:
- 68-75% SiO.sub.2, 10-18% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3 and 0-5% K.sub.2 O, and colorants consisting essentially of from about 1.3 to 2 weight percent Fe.sub.2 O.sub.3 (total iron), from about 0.01 to 0.05 weight percent NiO, from about 0.02 to 0.04 weight percent Co.sub.3 O.sub.4 and from 0.0002 to 0.003 weight percent Se, and having a ferrous value in the range of 18 to 30 percent;
- the glass having a shading coefficient of no more than 0.53.
A soda-lime-silica glass having a base glass composition comprising on a weight percent basis:
- 68-75% SiO.sub.2, 10-18% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3 and 0-5% K.sub.2 O, and colorants consisting essentially of from about 1.3 to 2 weight percent Fe.sub.2 O.sub.3 (total iron), from about 0.01 to 0.05 weight percent NiO, from about 0.02 to 0.04 weight percent Co.sub.3 O.sub.4 and from 0.0002 to 0.003 weight percent Se, and having a ferrous value in the range of 18 to 30 percent;
- the glass having a visible light transmittance of no more than 25 percent, a total solar energy transmittance of no more than 25 percent and an ultraviolet radiation transmittance of no more than 15 percent at a nominal thickness of 4 millimeters.
A soda-lime-silica glass having a base glass composition comprising on a weight percent basis:
- 68-75% SiO.sub.2, 10-18% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3 and 0-5% K.sub.2 O, and colorants consisting essentially of from about 1.3 to 2 weight percent Fe.sub.2 O.sub.3 (total iron), from about 0.01 to 0.05 weight percent NiO, from about 0.02 to 0.04 weight percent Co.sub.3 O.sub.4 and from 0.0002 to 0.003 weight percent Se, and having a ferrous value in the range of 18 to 30 percent;
- the glass having a visible light transmittance of no more than 20 percent, a total solar energy transmittance of no more than 18 percent and not exceeding the value of the visible light transmittance, and an ultraviolet radiation transmittance of no more than 15 percent at a nominal thickness of 4 millimeters.
A soda-lime-silica glass having a base glass composition comprising on a weight percent basis:
- 68-75% SiO.sub.2, 10-18% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3 and 0-5% K.sub.2 O, and colorants consisting essentially of from about 1.3 to 1.6 weight percent Fe.sub.2 O.sub.3 (total iron), from about 0.0225 to 0.0285 weight percent NiO, from about 0.020 to 0.026 weight percent Co.sub.3 O.sub.4 and from 0.0010 to 0.0020 weight percent Se, and having a ferrous value in the range of 18 to 30 percent;
- the glass having a visible light transmittance of no more than 25 percent, a total solar energy transmittance of no more than 25 percent and an ultraviolet radiation transmittance of no more than 15 percent at a nominal thickness of 4 millimeters.
Dependencies are inferred from the claim text.